<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>生成器函数实例</title>
</head>

<body>
    <script>
        //异步编程 文件操作，网络操作(ajax, request) 数据库操作
        //1s 后控制台输出111 2s后输出222 3s后输出333
        // 回调地狱(避免)
        setTimeout(() => {
            console.log(111);
            setTimeout(() => {
                console.log(222);
                setTimeout(() => {
                    console.log(333);
                }, 3000);
            }, 2000);
        }, 1000);



        function one() {
            setTimeout(() => {
                console.log(111);
                iterator.next();
            }, 1000);
        }

        function two() {
            setTimeout(() => {
                console.log(222);
                iterator.next();
            }, 2000);
        }

        function three() {
            setTimeout(() => {
                console.log(333);
                iterator.next();
            }, 3000);
        }

        function * get() {
            yield one();
            yield two();
            yield three();
        }

        //调用生成器函数
        let iterator = gen();
        iterator.next();
    </script>
</body>

</html>